Tandem [4 + 2]/[3 + 2] Cycloadditions of Nitroalkenes. 13. The Synthesis of (−)-Detoxinine
作者:Scott E. Denmark、Alexander R. Hurd、Hubert J. Sacha
DOI:10.1021/jo962306n
日期:1997.3.1
(-)-Detoxinine, an unusual, highly-functionalized amino acid, is the core residue of many components that comprise the detoxin complex. The synthesis of(-)-detoxinine was accomplished in 10 steps and 13.4% overall yield from commercially available dichlorodiisopropylsilane. The key step is an asymmetric tandem inter [4 + 2]/intra [3 + 2] cycloaddition between silyoxynitroalkene 17 and chiral vinyl ether (-)-24, illustrating the application of a temporary silicon tether in the tandem nitroalkene cycloaddition process.
Substituents effects on the addition of silyllithium and germyllithium to C60
作者:Takahiro Kusukawa、Wataru Ando
DOI:10.1016/s0022-328x(98)00497-5
日期:1998.6
Mono-adducts 2 and di-adducts 3 are obtained by the reaction with silyllithium and germyllithium 1 with C-60. The selectivities of the products are controlled by electronic and steric effects of the substituents. Formations of 1,4-adduct 4 and dimer 5 can be obtained in the presence of biphenyl derivatives. (C) 1998 Elsevier Science S.A. All rights reserved.