hydroxyalkenes were synthesized from the succinimide through a sequence involving N-alkylation, cross-olefin metathesis, and hydride reduction. The dibenzylamino group gave stereocontrol of the key N-acyliminium ion cyclization of these hydroxy lactams. 5-Substituted aminoindolizidines were synthesized with high diastereoselectivity at C6. A tandemcyclization of an N-(6-hydroxyhex-3-en-1-yl) γ-hydroxy lactam
8-Aminoindolizidines 合成自l-天冬酰胺作为手性起始材料。关键的二苄氨基琥珀酰亚胺中间体分两步合成。通过涉及N-烷基化、交叉烯烃复分解和氢化物还原的序列,由琥珀酰亚胺合成了三个与羟基烯烃连接的手性羟基内酰胺同系物。二苄氨基对这些羟基内酰胺的关键N-酰基亚胺离子环化提供立体控制。以高非对映选择性在 C6 合成了 5-取代的氨基中氮茚。N -(6-hydroxyhex-3-en-1-yl) γ-羟基内酰胺的串联环化导致形成四氢呋喃[2,3- g ] 中氮茚体系。
Synthesis of 1-Azaspiro[4,5]-7-decen-2-one from L-Asparagine and L-Aspartic Acid