Synlett 2019; 30(14): 1632-1642
DOI: 10.1055/s-0037-1611866
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© Georg Thieme Verlag Stuttgart · New York

Evolution of a Chemical Strategy Toward the Synthesis of Unsymmetrically Oxidized Nuphar Alkaloids

Jacob J. Lacharity
,
Armen Zakarian
This work was supported by the National Institutes of Health (NIH) – National Institute of General Medical Sciences (NIGMS R01, Grant No. 077379). J.J.L. was supported by a UCSB Chancellor’s Fellowship. Funding for the UCSB MRL Mass Spectrometry Facility was provided by the MRSEC Program of the National Science Foundation (NSF, under award NSF DMR 1121053).
Further Information

Publication History

Received: 29 April 2019

Accepted after revision: 21 May 2019

Publication Date:
27 June 2019 (online)


Abstract

Here we describe the frustrations, joys, and unexpected turns experienced in our journey toward a successful strategy directed at the total synthesis of unsymmetrically oxidized Nuphar thioalkaloids. While many adjustments were made to our initial synthesis plan, our general approach to the construction of the central bis(spirothiolane) moiety remained unchanged. Specifically, each iteration of our synthesis design involved the formation of the thiaspirane motif through the stereodivergent coupling of a thietane with a metal carbenoid, followed by a Stevens-type rearrangement of the resulting sulfonium ylide.

1 Introduction

2 First-Generation Strategy

3 Second-Generation Strategy

4 Third-Generation Strategy

5 Conclusion