Benzyl carbazate → N'-(1,1,2-trimethyl-1,1a,5,5a-tetrahydro-3-thia-cyclopropa[a]pentalene-4-carbonyl)-hydrazinecarboxylic acid benzyl ester

To a solution of (1aS,5aR)-1,1,2-trimethyl-1,1a,5,5a-tetrahydro-3-thia-cyclopropa[a]pentalene-4-carboxylic acid (2.2 g, 9.9 mmol), hydrazinecarboxylic acid benzyl ester (3.38 g, 20.4 mmol) and DIPEA (2 mL) in DCM (50 mL) is added TBTU (3.2 g, 10 mmol). The mixture is stirred at rt for 20 h. The mixture is diluted with Et2O (200 mL) and extracted with 1M aq. NaOH (3×50 mL) and 1M aq. HCl (2×50 mL). The organic phase is dried (Na2SO4), filtered and evaporated to give crude N′-(1,1,2-trimethyl-1,1a,5,5a-tetrahydro-3-thia-cyclopropa[a]pentalene-4-carbonyl)-hydrazinecarboxylic acid benzyl ester; LC-MS: tR=1.01 min, [M+1]+=371.25.

1. extractionextracted with 1M aq. NaOH (3×50 mL) and 1M aq. HCl (2×50 mL)
2. dry with materialThe organic phase is dried (Na2SO4)
3. filtrationfiltered
4. customevaporated

ORD record

ord-f7f3f9bd0949405f8d5719781c8bed9d

Source dataset

uspto-grants-2014_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08697732B2