生化研究。
用途简介 用途生化研究。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | N-acetyl serine methyl ester | —— | C6H11NO4 | 161.158 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
N-乙酰基-D-丝氨酸 | (R)-2-acetamido-3-hydroxypropanoic acid | 152612-69-6 | C5H9NO4 | 147.131 |
—— | N-acetyl-DL-serine ethyl ester | 74802-31-6 | C7H13NO4 | 175.185 |
The biomimetic oxidative coupling of the ethyl ester of N-acetyl-3,5-diiodotyrosine (1) to yield the ethyl ester of N-acetylthyroxine (2) has been investigated. A putative mechanism involving phenolic coupling to yield an intermediate aryloxydienone (7) followed by an E2 elimination for loss of the side chain has been proposed. Oxidative couplings with analogous 4-substituted 3,5-diiodophenols indicate that a number of mechanisms are possible; these include quinone methide intermediates and SN2 substitutions in the intermediate aryloxydienones. Rearomatization of the intermediate aryloxydienones is a strong driving force for the loss of the side chains. The results indicate that 3,5-diiodo-4-aryloxydienones are good leaving groups in E2 and SN2 mechanisms. The synthetic method provides a facile synthesis of thyroxine analogues from readily available 4-substituted 3,5-diiodophenols. Keywords: diiodotyrosine, phenolic coupling, phenoxyl radicals, thyroxine.