Stereospecific Conversion of Boronic Esters into Enones using Methoxyallene: Application in the Total Synthesis of 10-Deoxymethynolide

被引:5
作者
Chambers, Kristian J. [1 ]
Sanghong, Patthadon [1 ]
Carter Martos, Daniel [1 ]
Casoni, Giorgia [1 ]
Mykura, Rory C. [1 ]
Prasad Hari, Durga [1 ]
Noble, Adam [1 ]
Aggarwal, Varinder K. [1 ]
机构
[1] Univ Bristol, Sch Chem, Bristol BS8 1TS, England
基金
英国工程与自然科学研究理事会;
关键词
Enones; Lithiation-Borylation; Organoboron Compounds; Stereospecificity; Total Synthesis; ALPHA; BETA-UNSATURATED CARBONYL-COMPOUNDS; ASYMMETRIC CONJUGATE ADDITION; STEREOSELECTIVE-SYNTHESIS; PROTEIN-KINASES; SECONDARY; DERIVATIVES; ALCOHOLS; TARGET; SITE;
D O I
10.1002/anie.202312054
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Enones are widely utilized linchpin functional groups in chemical synthesis and molecular biology. We herein report the direct conversion of boronic esters into enones using commercially available methoxyallene as a three-carbon building block. Following boronate complex formation by reaction of the boronic ester with lithiated-methoxyallene, protonation triggers a stereospecific 1,2-migration before oxidation generates the enone. The protocol shows broad substrate scope and complete enantiospecificity is observed with chiral migrating groups. In addition, various electrophiles could be used to induce 1,2-migration and give a much broader range of alpha-functionalized enones. Finally, the methodology was applied to a 14-step synthesis of the enone-containing polyketide 10-deoxymethynolide. A one-pot strategy for the stereospecific conversion of boronic esters into enones has been developed using methoxyallene as a commercially available, three-carbon building block. The methodology is suitable for primary, secondary, and tertiary boronic esters and has been applied to a 14-step total synthesis of the polyketide 10-deoxymethynolide.image
引用
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页数:6
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