A Practical and Scaleable Synthesis of 1<i>R</i>,5<i>S</i>-Bicyclo[3.1.0]hexan-2-one: The Development of a Catalytic Lithium 2,2,6,6-Tetramethylpiperidide (LTMP) Mediated Intramolecular Cyclopropanation of (<i>R</i>)-1,2-Epoxyhex-5-ene
作者:Anthony D. Alorati、Matthew M. Bio、Karel M. J. Brands、Ed Cleator、Antony J. Davies、Robert D. Wilson、Chris S. Wise
DOI:10.1021/op700042w
日期:2007.5.1
An efficient synthesis of 1R,5S-bicyclo[ 3.1.0] hexan-2-one from (R)-1,2-epoxyhex-5-ene is described. Development of a catalytic intramolecular cyclopropanation of (R)-1,2-epoxyhex-5-ene gives the key homochiral bicycle[ 3.1.0] hexan-1-ol, which is then oxidized to the desired ketone. This process has been successfully demonstrated on a multi-kilogram scale.
Prevost,C. et al., Bulletin de la Societe Chimique de France, 1964, p. 2485 - 2492
作者:Prevost,C. et al.
DOI:——
日期:——
Enantioselective Synthesis of Biscyclopropanes Using Alkynes as Dicarbene Equivalents
作者:Chuntao Wang、Rui Wu、Kai Chen、Shifa Zhu
DOI:10.1002/anie.202305864
日期:2023.7.17
2–3 all-carbon quaternary centers were constructed with excellent stereoselectivity in one step. The method was extended to the cyclopropanation/cyclopropenation. In these processes, the functional alkyne is used as a dicarbene equivalent and 3 new rings are formed.
报道了手性Rh 2 (II) 催化的CF 2 H-取代的烯炔与烯烃的双环丙烷化反应。一步构建了具有4-5个邻位立体中心和2-3个全碳季中心的双环丙烷,具有良好的立体选择性。该方法扩展到环丙烷化/环丙烯化。在这些过程中,官能炔被用作二碳烯等价物,并形成 3 个新环。