Efficient Solid-Phase Synthesis of Highly Functionalized 1,4-Benzodiazepin-5-one Derivatives and Related Compounds by Intramolecular Aza-Wittig Reactions
作者:Carmen Gil、Stefan Bräse
DOI:10.1002/chem.200401112
日期:2005.4.22
have been numerous reports on the synthesis of similar skeletons. We have employed the T1 triazene linker to yield 1,4-benzodiazepin-5-one. Starting from various substituted triazene resins, cleavage in the presence of an azide donor, such as trimethylsilylazide, gave rise to aryl azides. Intramolecularaza-Wittigreactions produced the appropriately functionalized N-heterocycles. By using this route
Facile Synthesis of 1,4-Benzodiazepin-5-one Derivatives via Intramolecular Aza-Wittig Reaction. Application to an Efficient Synthesis of O-Benzyl DC-81
The tandem Staudinger/aza-Wittig reaction of N-(o-azidobenzoyl)-alpha-amino acid esters gave the corresponding 1,4-benzodiazepin-5-one derivatives in moderate to good yields. This method was applied successfully to a new efficient synthesis of BzlDC-81.
Catalytic Staudinger/Aza-Wittig Sequence by in situ Phosphane Oxide Reduction
作者:Henri A. van Kalkeren、Colet te Grotenhuis、Frank S. Haasjes、C. Rianne A. Hommersom、Floris P. J. T. Rutjes、Floris L. van Delft
DOI:10.1002/ejoc.201300585
日期:2013.11
A Staudinger/aza-Wittig reaction sequence is described that is catalytic in phosphorus. Towards this end, the phosphaneoxide is reduced in situ by diphenylsilane, which allows for substoichiometric amounts of the catalyst 5-phenyldibenzophosphole to be used. The substrate scope is investigated and benzoxazoles, benzodiazepine imidates and a 2-methoxypyrrole were successfully synthesized. These investigations