本文描述了双环[1.1.0]丁烷(BCB)与咪唑烷/六氢嘧啶的B(C 6 F 5 ) 3催化的缩甲醛( n +3)( n =5和6)环加成。该反应为合成具有挑战性的中等桥环库(2,5-二氮杂双环[5.1.1]壬烷和2,6-二氮杂双环[6.1.1]癸烷)提供了一种模块化、原子经济且高效的策略,反应速度适中。达到优异的产量。该反应还具有操作简单、反应条件温和、底物范围广泛等特点。放大实验和产品的各种合成转化进一步凸显了合成实用性。
Use of Strain-Release for the Diastereoselective Construction of Quaternary Carbon Centers
作者:Tobias Pinkert、Mowpriya Das、Malte L. Schrader、Frank Glorius
DOI:10.1021/jacs.1c03492
日期:2021.5.26
formation of quaternary carbon centers with excellent diastereoselectivity via a strain-release protocol. An organometallic species is generated by Cp*Rh(III)-catalyzed C–H activation, which is then coupled with strained bicyclobutanes (BCBs) and a prochiral carbon electrophile in a three-component reaction. This work illustrates a rare example of BCBs in transition metal catalysis and demonstrates their
bicyclo[1.1.0]butanes. The mild photoredox conditions, which make use of a readily available and bench stable phenyl sulfonyl bicyclo[1.1.0]butane, proved to be amenable to a diverse range of α-amino and α-oxy carboxylic acids, providing a concise route to 1,3-disubstituted cyclobutanes. Furthermore, kinetic studies and DFT calculations unveiled mechanistic details on bicyclo[1.1.0]butanereactivity relative
Expanding the repertoire of electrophiles with unique reactivity features would facilitate the development of covalent inhibitors with desirable reactivityprofiles. We herein introduce bicyclo[1.1.0]butane (BCB) carboxylic amide as a new class of thiol-reactive electrophiles for selective and irreversible inhibition of targeted proteins. We first streamlined the synthetic routes to generate a variety
Investigating Bicyclobutane–Triazolinedione Cycloadditions as a Tool for Peptide Modification
作者:Brett D. Schwartz、Aidan P. Smyth、Philippe E. Nashar、Michael G. Gardiner、Lara R. Malins
DOI:10.1021/acs.orglett.1c04071
日期:2022.2.18
cycloaddition reactions with a diverse array of triazolinedione reagents. The synthesis of an orthogonally protected urazole buildingblock enabled the facile preparation of amino acid- and peptide-derived triazolinediones that undergo cycloaddition reactions to afford novel peptide conjugates. The additive-free and fully atom-economical nature of the transformation is a promising starting point for
Palladium Hydride-Enabled Hydroalkenylation of Strained Molecules
作者:Ziyan Zhang、Vladimir Gevorgyan
DOI:10.1021/jacs.2c09045
日期:2022.11.16
palladium hydride enabled hydroalkenylation of strained molecules. This new mild protocol proceeds via a regio- and chemoselective hydropalladation step, followed by a photoinduced radical alkyl Heck reaction. This methodology represents a new reactivity mode for strained molecules and opens new avenues for photoinduced palladium catalysis. The reaction is compatible with a wide range of functional groups