Synthesis 2024; 56(01): 87-106
DOI: 10.1055/s-0042-1751446
special topic
Advances in Skeletal Editing and Rearrangement Reactions

Recent Applications of Ammonium Ylide Based [2,3]-Sigmatropic and [1,2]-Stevens Rearrangements To Transform Amines into Natural Products

Zachary Schwartz
,
Chelsea Valiton
,
Myles Lovasz
,
We are grateful for financial support from the University of Utah Department of Chemistry and the Donors of the American Chemical Society Petroleum Research Fund (ACS PRF 62220-DNI1).


Abstract

Ammonium ylide based [2,3]-sigmatropic and [1,2]-Stevens rearrangements enable the transformation of tertiary amines into rearranged and functionalized intermediates en route to many polycyclic natural product targets. Herein, we summarize recent applications of these rearrangement reactions in formal and total synthesis endeavors while highlighting innovative improvements to these transforms.

1 Introduction

2 Ammonium Ylide Based [2,3]-Sigmatropic Rearrangements in Natural Product Synthesis

2.1 (–)-Cephalotaxine

2.2 (±)-Amathaspiramide F

2.3 (–)-Cephalezomine G and Its C3 Epimer

2.4 (±)-Strictamine

2.5 (–)-Doxycycline

3 [1,2]-Stevens Rearrangements Toward Natural Products

3.1 Ring-Expanding [1,2]-Stevens Rearrangements en route to (±)-Tylophorine, (±)-7-Methoxycryptopleurine, and (±)-Xylopinine

3.2 Enantioselective Synthesis of Iboga Alkaloids and (+)-Vinblastine

4 Selected Methodology

4.1 Ammonium Ylide Based [2,3]-Sigmatropic Rearrangements To Form Natural Product Cores

4.2 Cascade Reactions Involving [1,2]-Stevens Rearrangement/ Hofmann-Type Elimination Events

5 Conclusions



Publication History

Received: 05 February 2023

Accepted after revision: 23 March 2023

Article published online:
04 May 2023

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