7-nitro-3,4-dihydro-1H-2,1-benzoxaborinin-1-ol synthesis
- Product Name:7-nitro-3,4-dihydro-1H-2,1-benzoxaborinin-1-ol
- CAS Number:1335095-07-2
- Molecular formula:C8H8BNO4
- Molecular Weight:192.97
19206-51-0
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Yield:1335095-07-2 44%
Reaction Conditions:
with nitric acid at -45 - -40; for 0.166667 h;
Steps:
1
[0224] To 4.0 mL fuming HN03 at -45 °C was added 3,4-dihydro-benzo[c][l,2] oxaborinin-l-ol ( 497 mg, 3.4 mmol) in small portions while maintaining the reaction temperature between -40 to -45 °C. Once the addition was complete the resulting solution was allowed to stir at -45 0 C for an additional 10 min before poured into crushed ice (20 g). The ice mixture was allowed to warm up to room temperature gradually and the precipitate was collected by filtration and washed with H20 to give 7-nitro-3,4-dihydro-benzo[c][l,2] oxaborinin-l-ol as a white powder. 1H NMR (acetone) δ: 8.51 (d, J = 2.5 Hz, 1H), 8.24 (dd, J = 8.3, 2.6 Hz, 1H), 7.75 (s, 1H), 7.50 (d, J = 8.4 Hz, 1H), 4.19 (t, J = 6.0 Hz, 2H), 3.07 (t, J = 6.0 Hz, 2H). Amount obtained: 286 mg, 44% yield.
References:
WO2011/116348,2011,A1 Location in patent:Page/Page column 78
1074-16-4
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