Enantioselective Synthesis of cis-Fused Cyclooctanoids via Rhodium(I)-Catalyzed [4 + 2 + 2] Cycloadditions
作者:Brendan C. Lainhart、Erik J. Alexanian
DOI:10.1021/acs.orglett.5b00267
日期:2015.3.6
o]-type cycloadditions offer efficient, atom-economical routes to diverse complexcarbocycles. Recently, such transformations have emerged as unique strategies for medium ring carbocyclesynthesis. Despite the important developments in this area, however, highly enantioselective [m + n + o]-type processes accessing medium ring carbocycles have yet to be developed. Herein, a rhodium-catalyzed [4 + 2 + 2]
催化多组分[ m + n + o ]型环加成化合物提供了高效,原子经济的途径,可通往各种复杂的碳环化合物。最近,这种转化已成为中环碳环合成的独特策略。尽管在该领域取得了重要进展,但是,高度对映选择性[ m + n + o进入中环碳环化合物的]型过程尚未开发。在本文中,报道了铑催化的烯丙二烯与丙二烯的[4 + 2 + 2]环加成反应,从而能够直接立体选择性地合成顺式融合的环辛烷类化合物。这些环加成成功地用于各种π组分,并证明了在[4 + 2 + 2]过程中高水平对映选择性的潜力。