Vinyl MIDA boronate: a readily accessible and highly versatile building block for small molecule synthesis

摘要

Iterative cross-coupling, represents a potentially general approach for the simple, efficient, and flexible construction of natural products, pharmaceuticals, and materials. N-Methylininodiacetic acid (MIDA) boronates represent a promising platform for the development of this type of synthesis strategy. This report describes the discovery that vinyl MIDA boronate (1) is all air- and chromatographically stable compound that can be conveniently prepared on a multigram scale and serve as a versatile starting material for the preparation of a range of new MIDA boronate building blocks. Analogous to tert-butylethylene, 1 is also all excellent substrate for olefin cross-metathesis, providing access to a range of trans-alkenyl MIDA boronates as single stereoisorners. An improved synthesis of the very versatile bifunctional building block trans-(2-biomovinyl) MIDA boronate (2) is also described. Collectively, these results contribute to the expanding generality of the iterative cross-coupling approach.