A synthetic strategy using Witkop's pyrroloindole for (−)-debromoflustramine B, (+)-ent-debromoflustramine B and (+)-ent-debromoflustramide B
摘要:
While prenylation of (-)-Witkop's pyrroloindole (2), secured from L-tryptophan under standard N-alkylation conditions, led to a ca. 1: 1 diastereoisomeric mixture of two C-3a-alkylated indolenines 3 and 4, use of phase-transfer conditions altered this to ca. 1: 2. Reduction followed by N-prenylation of the resulting secondary amines gave C, N-dialkylated products. The derived separable diastereoisomeric (-)-and (+)-Barton esters 19a and 19b were then converted into (-)-debromoflustramine B and (+)-ent-debromoflustramine B, respectively. A novel reaction involving oxygen and the carbanion derived from Barton ester 19b led to (+)-ent-debromoflustramide B. Treatment of N-8-prenylated Witkop's pyrroloindole 5 with Lewis acid (BF3 center dot Et2O) uncovered a new clean intramolecular cyclisation involving the prenyl unit. (C) 2007 Elsevier Ltd. All rights reserved.
A new synthesis of (−)-debromoflustramine B, (+)-ent-debromoflustramine B and (+)-debromoflustramide B
摘要:
The first synthesis of (-)-debromoflustramine B is reported. Appropriate structural modifications of an optically pure Barton ester, obtained in five steps from N-acetyl-L-tryptophan methyl ester, lead to the alkaloid. (C) 2001 Elsevier Science Ltd. All rights reserved.