The 3,4-dihydro-2H-pyran approach to (+)-milbemycin β<sub>3</sub>. Part 2. An improved synthesis of (2R,4S,6S,8R,9S)-2-[(5R)-(2E)-3-methyl-5-formyl-hex-2-en-1-yl]-8,9-dimethyl-4-(dimethyl-t-butylsilyloxy)-1,7-dioxaspiro[5.5]undecane
作者:Philip J. Kocieński、Stephen D. A. Street、Clive Yeates、Simon F. Cambell
DOI:10.1039/p19870002189
日期:——
A more efficient synthesis of the title compound (2), previously used in a total synthesis of (+)-milbemycin β3(1), is described. The key step in the sequence involves a nucleophilic cleavage of the oxirane (4) by the organocuprate derived from metallation of (2R,3S)-2,3-dimethyl-3,4-dihydro-2H-pyran (5).
Kocienski, Philip J.; Yeates, Clive; Street, Stephen D. A., Journal of the Chemical Society. Perkin transactions I, 1987, p. 2183 - 2188
作者:Kocienski, Philip J.、Yeates, Clive、Street, Stephen D. A.、Campbell, Simon F.
DOI:——
日期:——
KOCIENSKI, PHILIP J.;YEATES, CLIVE;STREET, STEPHEN D. A.;CAMPBELL, SIMON +, J. CHEM. SOC. PERKIN TRANS., 1,(1987) N 10, 2183-2187
作者:KOCIENSKI, PHILIP J.、YEATES, CLIVE、STREET, STEPHEN D. A.、CAMPBELL, SIMON +
DOI:——
日期:——
KOCIENSKI, PHILIP J.;STREET, STEPHEN D. A.;YEATES, CLIVE;CAMBELL, SIMON F+, J. CHEM. SOC. PERKIN TRANS., 1,(1987) N 10, 2189-2194
作者:KOCIENSKI, PHILIP J.、STREET, STEPHEN D. A.、YEATES, CLIVE、CAMBELL, SIMON F+
DOI:——
日期:——
A synthesis of (+)-milbemycin β<sub>3</sub>. The 3,4-dihydro-2H-pyran approach
作者:Clive Yeates、Stephen D. A. Street、Philip Kocienski、Simon F. Campbell
DOI:10.1039/c39850001388
日期:——
Nucleophilic scission of oxirane (8) by vinyl alanate (4) and oxirane (11) by metallated 3,4-dihydro-2H-pyran (15) were key steps in the synthesis of (+)-milbemycin β3(1).