LEE, EUN;HUR, CHANG-UK;PARK, JEONG-HO, TETRAHEDRON LETT., 30,(1989) N1, C. 7219-7220
作者:LEE, EUN、HUR, CHANG-UK、PARK, JEONG-HO
DOI:——
日期:——
Intramolecular cyclization of acetylenic homoallylic ketones mediated by the addition of stannyl radicals; a short facile pathway to α-methylene-β-substituted cyclopentanones
作者:Eun Lee、Chang-Uk Hur、Jeong-Ho Park
DOI:10.1016/s0040-4039(01)93939-5
日期:1989.1
α-(Stannyl)methylenecyclopentanones are obtained by tributylstannane addition reactions of acetylenic homoallylic ketones. α-Methylenecyclopentanones are produced upon destannylation.
Catalytic Asymmetric Spirocyclizing Diels–Alder Reactions of Enones: Stereoselective Total and Formal Syntheses of α-Chamigrene, β-Chamigrene, Laurencenone C, Colletoic Acid, and Omphalic Acid
作者:Santanu Ghosh、Johannes Eike Erchinger、Rajat Maji、Benjamin List
DOI:10.1021/jacs.2c01971
日期:2022.4.20
We disclose a general catalytic enantioselective Diels–Alderreaction of exo-enones with dienes to give spirocyclanes. The obtained products feature highly congested quaternary stereogenic spirocenters and are used in concise total and formal syntheses of several sesquiterpenes, including of α-chamigrene, β-chamigrene, laurencenone C, colletoic acid, and omphalic acid. The stereo- and regioselectivities