Resolution of racemic 2,6,6-trimethyl-7-oxa-bicyclo[3.1.1]octan-2-ol and 1,6,6-trimethyl-7-oxa-bicyclo[3.1.1]octan-2-ol by microbial esterification
作者:Mitsuo Miyazawa、Keisuke Tsuruno、Hiromu Kameoka
DOI:10.1016/s0957-4166(97)00228-0
日期:1997.7
Resolution of racemic 2,6,6-trimethyl-7-oxa-bicyclo[3.1.1]octan-2-ol and racemic 1,6,6-trimethyl-7-oxa-bicyclo[3.1.1]octan-2-ol via esterification with malonic acid by Glomerella cingulata, is described. Both of alcohols and malonic esters could be obtained in enantiomerically pure states. (C) 1997 Elsevier Science Ltd.
Cyclization of unsaturated monoterpenic alcohols mediated by thallium (III) salts
作者:Helena M.C. Ferraz、Carlos M.R. Ribeiro、Mônica V.A. Grazini、Timothy J. Brocksom、Ursula Brocksom
DOI:10.1016/s0040-4039(00)76741-4
日期:1994.3
thallium trinitrate with four monoterpenic unsaturated alcohols (isopulegol, neo-isopulegol, cis-carveol and α-terpineol), in AcOH:H2O (1:1, vol/vol) as solvent, led to the corresponding β-hydroxy-cyclic ethers with high regio- and stereoselectivity, in moderate to good yields. A mechanism of ring-contraction or ring-expansion of the oxythallated adduct is proposed, based on the substitution patterns of