<i>trans</i>-6-Aminocyclohept-3-enols, a New Designed Polyfunctionalized Chiral Building Block for the Asymmetric Synthesis of 2-Substituted-4-hydroxypiperidines
作者:Paolo Celestini、Bruno Danieli、Giordano Lesma、Alessandro Sacchetti、Alessandra Silvani、Daniele Passarella、Andrea Virdis
DOI:10.1021/ol025683x
日期:2002.4.1
trans-6-Aminocyclohept-3-enols 18 and ent-18 are new designed polyfunctionalized chiral building blocks for piperidine alkaloids synthesis and are prepared in high yields from the enzymatically derived cyclohept-3-ene-1,6-diol monoacetate (-)-8. Efficient highly enantioselective syntheses of cis-4-hydroxypipecolic acid (1) and piperidines 3 and 4, in both enantiomeric forms, are described. [reaction:
反式6-氨基环庚-3-烯醇18和ent-18是新设计的用于哌啶生物碱合成的多官能手性结构单元,由酶衍生的环庚-3-烯-1,6-二醇单乙酸酯(-)高产率制备。 -8。描述了两种对映体形式的高效的高对映选择性的顺式-4-羟基哌酸(1)和哌啶3和4的合成。[反应:看文字]