Three Routes for the Synthesis of 6-Benzyl-1-ethoxymethyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbaldehyde
作者:Lene Petersen、Erik B. Pedersen、Claus Nielsen
DOI:10.1055/s-2001-12352
日期:——
6-Benzyl-1-ethoxymethyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbaldehyde (1) is an analog of MKC-442, a very potent inhibitor of HIV-1 reverse transcriptase. Compound 1 was synthesized by three different routes. 6-Benzyl-1-ethoxymethyl-5-vinyl-1H-pyrimidine-2,4-dione (7) was synthesized in five steps from 6-benzyl-1H-pyrimidine-2,4-dione (2) by iodination; N-1 alkylation, N-3 protection, Pd(0) catalyzed coupling with tetravinyltin and then N-3 deprotection. Compound 7 was then cleaved with ozone to give compound 1. In another route compound 2 was hydroxymethylated, oxidized and N-1 alkylated to give compound 1. Finally, compound 1 was synthesized from 6-benzyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbonitrile (10) by reduction with Raney Nickel followed by N-1 alkylation. An attempt was made to use compound 7 as a precursor for 6-benzyl-1-ethoxymethyl-5-oxiranyl-1H-pyrimidine-2,4-dione (11) by reacting 7 with MCPBA, but compound 11 was too reactive and was ring-opened by the m-chlorobenzoate present in the solution. Two intermediates were N-1 alkylated to give new MKC-442 analogs containing a hydroxymethyl group (13) or a cyano group (14) in the C-5 position. None of the compounds showed activity against the mutated HIV-1 virus (Tyr181Cys) but good activities were observed against wild-type HIV-1 for the intermediates 4 and 7 containing iodine or a vinyl group in the C-5 position, respectively.
6-苄基-1-乙氧基甲基-2,4-二氧代-1,2,3,4-四氢嘧啶-5-甲醛(1)是 MKC-442 的类似物,MKC-442 是一种非常有效的 HIV-1 逆转录酶抑制剂。化合物 1 通过三种不同的途径合成。6-苄基-1-乙氧基甲基-5-乙烯基-1H-嘧啶-2,4-二酮(7)是由 6-苄基-1H-嘧啶-2,4-二酮(2)通过碘化、N-1 烷基化、N-3 保护、钯(0)催化与四乙烯基锡偶联以及 N-3 去保护五个步骤合成的。最后,化合物 1 由 6-苄基-2,4-二氧代-1,2,3,4-四氢嘧啶-5-甲腈(10)通过雷尼镍还原和 N-1 烷基化合成。有人尝试用化合物 7 作为 6-苄基-1-乙氧基甲基-5-环氧乙烷基-1H-嘧啶-2,4-二酮(11)的前体,将 7 与 MCPBA 反应,但化合物 11 反应性太强,被溶液中的间氯苯甲酸酯开环。两个中间体经过 N-1 烷基化,得到了在 C-5 位含有羟甲基(13)或氰基(14)的新 MKC-442 类似物。这些化合物均未显示出对变异 HIV-1 病毒(Tyr181Cys)的活性,但在 C-5 位分别含有碘基或乙烯基的中间体 4 和 7 对野生型 HIV-1 具有良好的活性。