Straight and versatile synthesis of substituted perhydrofuro[2,3-b]pyrans from 2-chloromethyl-3-(2-methoxyethoxy)propene
作者:Francisco Alonso、Emilio Lorenzo、Jaisiel Meléndez、Miguel Yus
DOI:10.1016/s0040-4020(03)00781-6
日期:2003.7
powder and a catalytic amount of naphthalene (2.5%) in the presence of a carbonyl compound (E1=R1R2CO) in THF at −78 to 0°C, followed by the addition of an epoxide [E2=R3R4C(O)CHR5] at 0 to 20°C leads, after hydrolysis, to the expected methylidenic diols. These diols when subjected to successive hydroboration–oxidation and further oxidation, spontaneous cyclization occurs to furnish a series of differently
2-氯甲基-3-(2-甲氧基乙氧基)丙烯与过量的锂粉和催化量的萘(2.5%)在羰基化合物(E 1 = R 1 R 2 CO)存在下于THF中反应在-78至0℃下,在水解后,在0至20℃下添加环氧化物[E 2= R 3 R 4 C(O)CHR 5 ],得到预期的亚甲基二醇。这些二醇经过连续的硼氢化-氧化和进一步的氧化后,会发生自发环化,从而提供一系列不同取代的全氢呋喃[2,3- b ]吡喃。