188672-83-5|6-Nitrobenzo[d]thiazole-2-carbonitrile| Ambeed

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CAS No. :	188672-83-5
Formula :	C₈H₃N₃O₂S
M.W :	205.19
SMILES Code :	N#CC1=NC2=CC=C([N+]([O-])=O)C=C2S1
MDL No. :	MFCD18813190

GHS Pictogram:
Signal Word:	Warning
Hazard Statements:	H302-H315-H319-H335
Precautionary Statements:	P261-P305+P351+P338

Yield	Reaction Conditions	Operation in experiment
71%	With iron; acetic acid; at 20℃; for 24h;	Iron powder (68.05 g, 1218.55 mmol) was added to a suspension of 6-nitro-1,3-benzothiazole-2-carbonitrile (13, 5.00 g,24.37 mmol) in acetic acid (500 mL). The reaction mixture was stirred at room temperature for 24 h, diluted with water (1 L)and unreacted iron was removed by filtration through celite.The aqueous solution was extracted with EtOAc (4 × 500 mL).The combined organic layers were washed with brine (2 ×300 mL), dried (Na2SO4) and concentrated in vacuo. The crudeproduct was loaded onto a short plug of silica gel, flushedthrough with CHCl3(ca. 1 L) and concentrated in vacuo to give8as yellow microcrystals (3.02 g, 17.24 mmol, 71percent). A sample of 13was crystallised from EtOH for melting point analysis.Rf0.2 (SiO2, DCM); mp 219?220 °C (EtOH); 1H NMR(500 MHz, CDCl3) delta7.95 (d, J= 8.9 Hz, 1H, CH-4), 7.08 (d, J= 2.2 Hz, 1H, CH-7), 6.95 (dd, J= 8.8, 2.2 Hz, 1H, CH-5), 4.14(s, 2H, NH2); 13C NMR (125 MHz, CDCl3) delta147.8 (C-6),145.7 (C-7a), 138.3 (C-3a), 131.2(C-2), 126.1 (CH-4), 117.8(CH-5), 113.7 (C?N), 104.0 (CH-7).
	With stannous chloride; sodium hydrogencarbonate; In ethanol;	EXAMPLE 4Synthesis of 2-cyano-6-aminobenzothiazole (5)2-Cyano-6-aminobenzothiazole was synthesized from 2-cyano-6-nitrobenzothiazole according to the following reaction scheme.In particular, purified 2-cyano-6-nitrobenzothiazole 4 (0.49 mmol, 100 mg) was dissolved in 5 ml EtOH (200 Proof).2.5 equivalents of SnCl2 (1.3 mmol, 322 mg) was added to the flask.The reaction was heated to 60° C. under N2, and stirred for 2 h.Over time the mixture changed from a bright fluorescent yellow to an orange/yellow coloring.After cooling to room temperature (RT), the reaction was poured into ice water (~5 ml) and the pH was adjusted using NaHCO3 (pH 7).The product 5 was extracted using EtOAc, dried over MgSO4 and removed in vacuo (~65percent yield).Agilent HPLC displayed conversion to the crude product at 7.4 min.
		Example 4Synthesis of 2-cyano-6-aminobenzothiazole (5)2-Cyano-6-aminobenzothiazole was synthesized from 2-cyano-6-nitrobenzothiazole according to the following reaction scheme. In particular, purified 2-cyano-6-nitrobenzothiazole 4 (0.49 mmol, 100 mg) was dissolved in 5 ml EtOH (200 Proof). 2.5 equivalents of SnCl2 (1.3 mmol, 322 mg) was added to the flask. The reaction was heated to 60° C. under N2, and stirred for 2 h. Over time the mixture changed from a bright fluorescent yellow to an orange/yellow coloring. After cooling to room temperature (RT), the reaction was poured into ice water (5 ml) and the pH was adjusted using NaHCO3 (pH 7).The product 5 was extracted using EtOAc, dried over MgSO4 and removed in vacuo (65percent yield). Agilent HPLC displayed conversion to the crude product at 7.4 min. The product 5 was purified by gravity silica column chromatography (3 Hexane: 2 EtOAc) to yield an orange/yellow solid. ESI-MS: m/z calcd for C8H5N3S (M+H)+ 176.22. found 175.85 (100percent). 1H NMR (d6-DMSO, 500 MHz) delta (ppm)=6.15 and 6.55 (br s, NH2), 6.97 (dd, J=9.0 Hz, J=2.0 Hz), 7.15 (d, J=2.5 Hz), 7.86 (d, J=9.0 Hz). 13C NMR (d6-DMSO) delta (ppm)=102.2, 114.1, 117.3, 125.0, 127.7, 138.2, 143.2, 150.4.

Precautionary Statements-General
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P102	Keep out of reach of children.
P103	Read label before use
Prevention
Code	Phrase
P201	Obtain special instructions before use.
P202	Do not handle until all safety precautions have been read and understood.
P210	Keep away from heat/sparks/open flames/hot surfaces. - No smoking.
P211	Do not spray on an open flame or other ignition source.
P220	Keep/Store away from clothing/combustible materials.
P221	Take any precaution to avoid mixing with combustibles
P222	Do not allow contact with air.
P223	Keep away from any possible contact with water, because of violent reaction and possible flash fire.
P230	Keep wetted
P231	Handle under inert gas.
P232	Protect from moisture.
P233	Keep container tightly closed.
P234	Keep only in original container.
P235	Keep cool
P240	Ground/bond container and receiving equipment.
P241	Use explosion-proof electrical/ventilating/lighting/equipment.
P242	Use only non-sparking tools.
P243	Take precautionary measures against static discharge.
P244	Keep reduction valves free from grease and oil.
P250	Do not subject to grinding/shock/friction.
P251	Pressurized container: Do not pierce or burn, even after use.
P260	Do not breathe dust/fume/gas/mist/vapours/spray.
P261	Avoid breathing dust/fume/gas/mist/vapours/spray.
P262	Do not get in eyes, on skin, or on clothing.
P263	Avoid contact during pregnancy/while nursing.
P264	Wash hands thoroughly after handling.
P265	Wash skin thouroughly after handling.
P270	Do not eat, drink or smoke when using this product.
P271	Use only outdoors or in a well-ventilated area.
P272	Contaminated work clothing should not be allowed out of the workplace.
P273	Avoid release to the environment.
P280	Wear protective gloves/protective clothing/eye protection/face protection.
P281	Use personal protective equipment as required.
P282	Wear cold insulating gloves/face shield/eye protection.
P283	Wear fire/flame resistant/retardant clothing.
P284	Wear respiratory protection.
P285	In case of inadequate ventilation wear respiratory protection.
P231 + P232	Handle under inert gas. Protect from moisture.
P235 + P410	Keep cool. Protect from sunlight.
Response
Code	Phrase
P301	IF SWALLOWED:
P304	IF INHALED:
P305	IF IN EYES:
P306	IF ON CLOTHING:
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P312	Call a POISON CENTER or doctor/physician if you feel unwell.
P313	Get medical advice/attention.
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P320
P302 + P352	IF ON SKIN: wash with plenty of soap and water.
P321
P322
P330	Rinse mouth.
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P341	If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing.
P342	If experiencing respiratory symptoms:
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P353	Rinse skin with water/shower.
P360	Rinse immediately contaminated clothing and skin with plenty of water before removing clothes.
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P362	Take off contaminated clothing and wash before reuse.
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P370	In case of fire:
P371	In case of major fire and large quantities:
P372	Explosion risk in case of fire.
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P378
P380	Evacuate area.
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P390	Absorb spillage to prevent material damage.
P391	Collect spillage. Hazardous to the aquatic environment
P301 + P310	IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P301 + P312	IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P301 + P330 + P331	IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P302 + P334	IF ON SKIN: Immerse in cool water/wrap in wet bandages.
P302 + P350	IF ON SKIN: Gently wash with plenty of soap and water.
P303 + P361 + P353	IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P304 + P312	IF INHALED: Call a POISON CENTER or doctor/physician if you feel unwell.
P304 + P340	IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P304 + P341	IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing.
P305 + P351 + P338	IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P306 + P360	IF ON CLOTHING: Rinse Immediately contaminated CLOTHING and SKIN with plenty of water before removing clothes.
P307 + P311	IF exposed: call a POISON CENTER or doctor/physician.
P308 + P313	IF exposed or concerned: Get medical advice/attention.
P309 + P311	IF exposed or if you feel unwell: call a POISON CENTER or doctor/physician.
P332 + P313	IF SKIN irritation occurs: Get medical advice/attention.
P333 + P313	IF SKIN irritation or rash occurs: Get medical advice/attention.
P335 + P334	Brush off loose particles from skin. Immerse in cool water/wrap in wet bandages.
P337 + P313	IF eye irritation persists: Get medical advice/attention.
P342 + P311	IF experiencing respiratory symptoms: call a POISON CENTER or doctor/physician.
P370 + P376	In case of fire: Stop leak if safe to Do so.
P370 + P378	In case of fire:
P370 + P380	In case of fire: Evacuate area.
P370 + P380 + P375	In case of fire: Evacuate area. Fight fire remotely due to the risk of explosion.
P371 + P380 + P375	In case of major fire and large quantities: Evacuate area. Fight fire remotely due to the risk of explosion.
Storage
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P401
P402	Store in a dry place.
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P411 + P235	Keep cool.
Disposal
Code	Phrase
P501	Dispose of contents/container to ...
P502	Refer to manufacturer/supplier for information on recovery/recycling

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CAS No.: 188672-83-5

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CAS No.: 188672-83-5

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[ 188672-83-5 ] Synthesis Path-Downstream 1~2

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Physical hazards
Code	Phrase
H200	Unstable explosive
H201	Explosive; mass explosion hazard
H202	Explosive; severe projection hazard
H203	Explosive; fire, blast or projection hazard
H204	Fire or projection hazard
H205	May mass explode in fire
H220	Extremely flammable gas
H221	Flammable gas
H222	Extremely flammable aerosol
H223	Flammable aerosol
H224	Extremely flammable liquid and vapour
H225	Highly flammable liquid and vapour
H226	Flammable liquid and vapour
H227	Combustible liquid
H228	Flammable solid
H229	Pressurized container: may burst if heated
H230	May react explosively even in the absence of air
H231	May react explosively even in the absence of air at elevated pressure and/or temperature
H240	Heating may cause an explosion
H241	Heating may cause a fire or explosion
H242	Heating may cause a fire
H250	Catches fire spontaneously if exposed to air
H251	Self-heating; may catch fire
H252	Self-heating in large quantities; may catch fire
H260	In contact with water releases flammable gases which may ignite spontaneously
H261	In contact with water releases flammable gas
H270	May cause or intensify fire; oxidizer
H271	May cause fire or explosion; strong oxidizer
H272	May intensify fire; oxidizer
H280	Contains gas under pressure; may explode if heated
H281	Contains refrigerated gas; may cause cryogenic burns or injury
H290	May be corrosive to metals
Health hazards
Code	Phrase
H300	Fatal if swallowed
H301	Toxic if swallowed
H302	Harmful if swallowed
H303	May be harmful if swallowed