Double cascade reactions based on the Barbas dienamine platform: highly stereoselective synthesis of functionalized cyclohexanes for cardiovascular agents
作者:Dhevalapally B. Ramachary、Y. Vijayendar Reddy、B. Veda Prakash
DOI:10.1039/b718122a
日期:——
amino acid proline catalyzed the three- and five-component cascade olefination-Diels-Alder-epimerization and olefination-Diels-Alder-epimerization-olefination-hydrogenation reactions of readily available precursors enones 1a-i, arylaldehydes 2a-k, alkyl cyanoacetates 3a-e and Hantzsch ester 9 to furnish highly substituted prochiral 1-cyano-4-oxo-2,6-diaryl-cyclohexanecarboxylic acid alkyl esters 6 and
氨基酸脯氨酸催化容易获得的前体烯酮1a-i,芳醛2a-k,氰基乙酸烷基酯3a的三组分和五组分级联烯化-Diels-Alder-烯化和烯化-Diels-Alder-烯化-烯化-氢化反应。 -e和Hantzsch酯9提供高度取代的手性1-氰基-4-氧代-2,6-二芳基-环己烷甲酸烷基酯6和1-氰基-4-(氰基-烷氧基羰基-甲基)-2,6-二芳基-环己烷羧酸烷基酯10以高度非对映选择性的方式,具有优异的收率。前手性顺式异构体6是合成心血管药物和催眠活性产物的极好原料。