Chemo-enzymatic synthesis of both enantiomers of rugulactone
作者:Gowrisankar Reddipalli、Mallam Venkataiah、Nitin W. Fadnavis
DOI:10.1016/j.tetasy.2010.01.016
日期:2010.3
The synthesis of both the (R)- and (S)-enantiomers of the natural product rugulactone has been achieved. Candida rugosa lipase hydrolyzes the butyrate ester of the protected 3-hydroxy homoallylic alcohol with very high enantioselectivity (E = 244) and provides the key intermediates with high enantiomeric purity (ee 98–99%) and excellent yields.
Simple Stereoselective Synthesis of Unsaturated Lactone Intermediates and Their Conversion into Natural Dihydropyranones and Their Enantiomers#
作者:Digambar Balaji Shinde、Boddu Shashi Kanth、Avula Satyakumar、V.T. Kamble、Biswanath Das
DOI:10.2174/1570178611310050003
日期:2013.5.1
The stereoselectivesynthesis of the unsaturated lactoneintermediates, (S) - and (R)-2-(6-oxo-3, 6-dihydro-2Hpyran- 2-yl) acetaldehydes has been accomplished from propane 1,3 diol employing Maruoka asymmetric allylation and ring closing metathesis reaction. The intermediates were converted into two natural dihydropyranones, 6 (R)-4-oxopent-2- enyl 5,6-dihydro-2H-pyran-2-one and (R)- rugulactone and
The stereoselectivetotalsynthesis of both enantiomers of rugulactone 1 has been completed by applying enantioselective allyl additions as key steps. Two different strategies based on highly stable and enantiomerically pure α-substituted allylboronic esters 2 and 3 were performed starting from boronic ester 4.