Synthesis of the spiroketal fragment of avermectin B1b
作者:Michael T. Crimmins、Rosemary O'Mahony
DOI:10.1016/s0040-4039(01)93836-5
日期:1989.1
A new synthesis of the spiroketal fragment of the potent antiparasiticagent, avermectin B1b, utilizing an improved procedure for the preparation of unsaturated spiroketals from lactones is described.
作者:Wrackmeyer, Bernd、Kundler, Sabine、Milius, Wolfgang、Boese, Roland
DOI:——
日期:——
New phosphabenzenes by [4 + 2] cycloaddition of stannoles to 1-phospha-1-alkynes — determination of signs of coupling constants
作者:Bernd Wrackmeyer、Uwe Klaus
DOI:10.1016/0022-328x(96)06316-4
日期:1996.8
Stannoles bearing dialkylboryl groups in 3-position react with 1-phospha-1-alkynes P=C-(t)Bu (1) and P=C-CH(2)(t)Bu (2) by [4 + 2] cycloaddition and elimination of stannylene to give phosphabenzenes in high yield. The stannylenes oligomerise to give [R(2)(1)Sn](n) with n greater than or equal to 7 (R = Me, Et, -(CH2)(5)- or, in the case of R(1) = (t)Bu, react with the stannole itself. All phosphabenzenes are characterised by their consistent sets of NMR data. The absolute signs of the coupling constants (n)J(P-31, H-1), (n)J(P-31, C-13), (2)J(P-31, Si-29) and (2)J(Sn-119, P-31) were determined by appropriate 1D and 2D NMR experiments.
CRIMMINS, MICHAEL T.;OMAHORY, ROSEMARY, TETRAHEDRON LETT., 30,(1989) N4, C. 5993-5996
作者:CRIMMINS, MICHAEL T.、OMAHORY, ROSEMARY
DOI:——
日期:——
CRIMMINS, MICHAEL T.;HOLLIS, W. GARY, JR.;BANKAITIS-DAVIS, DANUTE M., TETRAHEDRON LETT., 28,(1987) N 32, 3651-3654
作者:CRIMMINS, MICHAEL T.、HOLLIS, W. GARY, JR.、BANKAITIS-DAVIS, DANUTE M.