Novel Methodology for the Preparation of 5-Substituted Tetrahydro[2,3-D]pyrimidines
作者:Samuel E. Watson、Edward C. Taylor、Hemantkar Patel
DOI:10.1080/00397919808007022
日期:1998.5
Abstract A convenient, concise route for the preparation of tetrahydropyrido[2,3-d]pyrimidines functionalized at the 5-position is presented starting from acyclic aldehydes. Key steps involve a high yielding Knoevenagel condensation, 1,4 conjugate addition with an allylcuprate and a pyrimidine annulation using guanidine hydrochloride. An improved synthesis of the starting aldehyde, ethyl 4-propalbenzoate
摘要 提出了一种以无环醛为原料制备 5 位官能化四氢吡啶并[2,3-d]嘧啶的简便、简洁的路线。关键步骤包括高收率的 Knoevenagel 缩合、使用烯丙基铜酸盐的 1,4 共轭加成和使用盐酸胍的嘧啶环化。提出了起始醛 4-丙苯甲酸乙酯的改进合成方法。