Angular hydroxymethylation of functionalized decalin systems
摘要:
Functionalized beta-dicarbonyl bicyclic compounds 5 and 17 were hydroxymethylated at the angular position as the (benzyloxy)methoxy derivatives with diisopropylethylamine (DIPEA) and benzyl chloromethyl ether in the presence of paraformaldehyde. The stereochemistry of cis-8a-[[(benzyloxy)methoxy]methyl]-3-(phenylthio)-4a,5,6,8a-tetrahydronaphthalene-1,8(4H,7H)-dione (12) was confirmed by X-ray analysis of the ethylene ketal 16.