Sodium Bicarbonate → (1R)-(+)-cis-Permethric acid

Participants

Reaction Conditions

Reaction Steps

A mixture of (1R,4R,5S)-6,6-dimethyl-4-(trichloromethyl)-3-oxabicyclo[3.1.0]hexan-2-one (I, R1=X1=X2=Cl) and (1R,4S,5S)-6,6-dimethyl-4-(trichloromethyl)-3-oxabicyclo[3.1.0]hexan-2-one (I, R1=X1=X2=Cl), 0.24 g (0.001 mol), is stirred with sodium hydrogen carbonate, 0.21 g (0.0025 mol), and Pd(C) 5%, 0.01 g, in about 4 ml of DMF at 50° C. under a hydrogen atmosphere of a slight overpressure. After stirring for ½ hour at 50° C. the mixture is stirred at room temperature. Samples taken out for GC analysis are treated with aqueous hydrochloric acid/methyl t-butyl ether and analysed on GC. After 16 hours GC analysis (area-%) shows a content of 39% of II and 32% of unreacted I. The retention time is identical to that of II prepared according to Ref.6, and MS (Mass (intensity in % of base peak): 208 (6) M+, 210 (4) (M+2)+, 175 (25), 173 (78), 165 (27), 163 (39), 111 (22), 109 (28), 91 (100), 77 (46), 39 (64)) is identical to MS of II prepared according to Ref.6.

Provenance & Evidence