5-(Methylthio)tetrazoles as Versatile Synthons in the Stereoselective Synthesis of Polycyclic Pyrazolines via Photoinduced Intramolecular Nitrile Imine-Alkene 1,3-Dipolar Cycloaddition. Academic Article uri icon

Overview

abstract

  • A key thioether substituent in readily accessible 2-alkyl-5-(methylthio)tetrazoles enables facile photoinduced denitrogenation and intramolecular nitrile imine 1,3-dipolar cycloaddition to afford a wide range of polycyclic pyrazoline products with excellent diastereoselectivity. The methylthio group red-shifts the UV absorbance of the tetrazole, obviating the requirement in all previous substrate systems for at least one aryl substituent, and can subsequently be converted into a variety of other functionalities. This synthetic platform has been applied to the concise total syntheses of the alkaloid natural products (±)-newbouldine and withasomnine.

publication date

  • June 1, 2014

Identity

PubMed Central ID

  • PMC4126266

Scopus Document Identifier

  • 84900321456

Digital Object Identifier (DOI)

  • 10.1039/C4SC00107A

PubMed ID

  • 25114776

Additional Document Info

volume

  • 5

issue

  • 6