作者:Mark S. Baird、Cynthia M. Dale、William Lytollis、Michael J. Simpson
DOI:10.1016/s0040-4039(00)91664-2
日期:1992.3
A series of esters of cyclopropene fatty acids, including sterculic, malvalic and sterculynic acids, has been prepared by alkylation of the corresponding 1-lithiocyclopropenes.
Cyclopropenylcarbinol Derivatives as New Versatile Intermediates in Organic Synthesis: Application to the Formation of Enantiomerically Pure Alkylidenecyclopropane Derivatives
作者:Samah Simaan、Ahmad Masarwa、Elinor Zohar、Amnon Stanger、Philippe Bertus、Ilan Marek
DOI:10.1002/chem.200901074
日期:2009.8.24
The copper‐catalyzed carbomagnesiation (or hydrometalation) reaction of chiralcyclopropenylcarbinolderivatives, obtained by means of a kinetic resolution of secondary allylic alcohols, leads to an easy and straightforward preparation of enantiomericallypurealkylidenecyclopropanederivatives. The reaction mechanism is composed of a syn‐carbometalation followed by a syn‐elimination reaction. To gain
Intramolecular Cyclopropene-Furan [2 + 4] Cycloaddition followed by a Cyclopropylcarbinyl Rearrangement to Synthesize the BCD Rings of Cortistatin A
作者:Philip Magnus、Ryan Littich
DOI:10.1021/ol901537n
日期:2009.9.3
Synthesis of the BCD ring system of cortistatin A has been accomplished in 9 steps and 30% overall yield starting from commercially available 2-methylcyclopent-2-enone. Key transformations include the addition of cyclopropenyllithium 16 to aldehyde 15, an intramolecular cyclopropene-furan [2 + 4] cycloaddition leading to epimers 18/19, and a subsequent cyclopropylcarbinyl rearrangement to afford 24
Regioselective Carbon–Carbon Bond Cleavage in the Oxidation of Cyclopropenylcarbinols
作者:Ahmad Basheer、Masaaki Mishima、Ilan Marek
DOI:10.1021/ol201581c
日期:2011.8.5
The strained double bond of cyclopropenylcarbinols undergoes a facile oxidation reaction to lead to unsaturated carbonyl derivatives. The distribution of the formed products depends on the relative stability of carbon-centered radical species, and the Sharpless kinetic resolution leads to enantiomerically pure Baylis–Hillman enal adducts.
Highly diastereoselective approach to methylenecyclopropanes via boron-homologation/allylboration sequences
作者:A. N. Baumann、A. Music、K. Karaghiosoff、D. Didier
DOI:10.1039/c5cc09904h
日期:——
A simple and efficient diastereoselective synthesis of methylenecyclopropanes is described, in which boron-homologation and allylboration are merged into a one-pot process, starting from in-situ generated cyclopropenyllithium species. This unprecedented methodology...