One-Pot Synthesis of Trisubstituted Monomethylated Benzene-1,3-diols via a Michael Addition-Dieckmann Cyclization Sequence from Methyl (<i>E</i>)-3-Methoxy-4-methoxycarbonylbut-2-enoate Anion and Methyl Alkynoates and Its Application to the Total Synthesis of Nidulol
作者:Adrián Covarrubias-Zúñiga、Laura San Germán-Sánchez、Luis A. Maldonado、Moisés Romero-Ortega、José G. Ávila-Zárraga
DOI:10.1055/s-2005-872082
日期:——
The reaction of methyl (E)-3-methoxy-4-methoxycarbonylbut-2-enoate (1) with a number of methyl alkynoates under appropriate conditions gave the monomethylated trisubstituted resorcinol derivatives 3 in a regiocontrolled manner, via a Michael addition-Dieckmann cyclization sequence in one pot. The resorcinol 3d, prepared in this manner, was used as the starting material for a three step, highly efficient
(E)-3-methoxy-4-methoxycarbonylbut-2-enoate (1) 与许多甲基炔酸酯在适当的条件下反应,通过 Michael 加成-Dieckmann 环化以区域控制的方式得到单甲基化的三取代间苯二酚衍生物 3一锅中的顺序。以这种方式制备的间苯二酚 3d 被用作生物活性真菌代谢物尼度洛 (4) 的三步高效(54% 来自 3d)合成的起始材料。
Nixon, Neil S.; Scheinmann, Feodor; Suschitzky, John L., Journal of Chemical Research, Miniprint, 1984, # 12, p. 3401 - 3448
作者:Nixon, Neil S.、Scheinmann, Feodor、Suschitzky, John L.
DOI:——
日期:——
Reduction of a-Pyrone Derivatives with Borane-Methyl Sulfide Complex
Selective reduction of the 5-carbomethoxy- and the 5-carbethoxy-4-hydroxy-2H-pyran-2-one derivatives (5a approximately 11, 19) to yield the 5-hydroxymethyl derivatives (12 approximately 18) was accomplished using 1.1 mol equivalent of borane-methyl sulfide complex. Additionally, reduction of the 3-acetyl-4-hydroxy-2H-pyran-2-one derivatives (23, 26 and 29) with borane-methyl sulfide complex afforded the binary condensed pyrone derivatives (25, 28 and 3 1) in good yields.