Biosynthesis of α-cyclopiazonic acid. Steric course of proton removal during the cyclisation of β-cyclopiazonic acid in Penicillium griseofulvum
作者:Amelia E. de Jesus、Pieter S. Steyn、Robert Vleggaar、Gordon W. Kirby、Michael J. Varley、Nicolaas P. Ferreira
DOI:10.1039/p19810003292
日期:——
that, in Penicillium griseofulvum Dierckx, incorporation of tryptophan into α-cycopiazonic acid (1) proceeds with loss of the 3-pro-S hydrogen atom. [3-2H2]Tryptophan was converted by P. griseofulvum into α-cyclopiazonic acid which was shown by 2H n.m.r. spectroscopy to contain deuterium only at the expected C-4 position. (2RS)-[2-3H,3-14C]Tryptophan was incorporated into α-cyclopiazonic acid (1) with
喂养实验用(3 - [R )-和(3小号) - [3- 3 H]色氨酸已经表明,在青霉griseofulvum Dierckx,色氨酸掺入α-cycopiazonic酸(1)与所述3-损失进行亲-小号氢原子。[3- 2 H 2 ]色氨酸被灰黄假单胞菌转化为α-环吡唑酮酸,其通过2 H nmr光谱法显示仅在预期的C-4位置含有氘。将(2 RS)-[ 2-3 H,3- 14 C]色氨酸掺入α-环吡嗪酸(1)中,但失去ca。%的50%。这些发现与通过1,4-二氢氢化衍生物将β-环吡嗪酸(4)环化为α-环吡嗪酸(1)一致,在C-4处的CC键从相反分子的一侧发生到质子去除发生的那个。