Dauben–Michno oxidative transposition of allylic cyanohydrins — Enantiomeric switch of (–)-carvone to (+)-carvone*Based on the 2010 Bader Award Lecture.
Dauben–Michno oxidative transposition of allylic cyanohydrins — Enantiomeric switch of (–)-carvone to (+)-carvone*Based on the 2010 Bader Award Lecture.
A New Lithium Alkoxide Accelerated Diastereoselective Cyanation of Ketones
作者:H. Scott Wilkinson、Paul T. Grover、Charles P. Vandenbossche、Roger P. Bakale、Nandkumar N. Bhongle、Stephen A. Wald、Chris H. Senanayake
DOI:10.1021/ol0069608
日期:2001.2.1
lithium heteroatom assisted TMSCN or TBSCN addition to aldehydes and ketones has been discovered. The process provides excellent selectivities and high rates. Conformationally constrained ketones such as camphor, fenchone, and nopinone give excellent diastereoselectivities with TMSCN. Reduction of 2 provided diastereopure amino alcohol 3 in good yield. alpha- and beta-Methyl cyclohexanones with TBSCN-LiOR
Robust and Efficient, Yet Uncatalyzed, Synthesis of Trialkylsilyl-Protected Cyanohydrins from Ketones
作者:Fabien L. Cabirol、Angela E. C. Lim、Ulf Hanefeld、Roger A. Sheldon、Ilya M. Lyapkalo
DOI:10.1021/jo702587e
日期:2008.3.1
High-yielding cyanosilylation of ketones with NaCN and various chlorotrialkylsilanes in DMSO proceeds smoothly without catalysis to give silyl-protected ketone cyanohydrins. The unique role of DMSO consists in rendering naked cyanide anions that reversibly add to the CO bond at the rate-determining step followed by fast trapping of the transient tertiary sodium cyanoalcoholates with chlorotrialkylsilanes
Enantiopure cycloheptenones from (R)-(−)-carvone: intermediates for perhydroazulene terpenoids
作者:Timothy John Brocksom、Ursula Brocksom、Damião Pergentino de Sousa、Daniel Frederico
DOI:10.1016/j.tetasy.2005.10.006
日期:2005.11
Two routes for the synthesis of enantiopure cycloheptenones, intermediates for perhydroazulene terpenoids, have been developed. They feature totally regioselective Tiffeneau–Demjanov and Nozaki ring expansion reactions of (R)-(−)-carvone.