作者:Barbara Zajc、Shivani Kake
DOI:10.1021/ol0616236
日期:2006.9.1
chiral alkyl alpha-(1,3-benzothiazol-2-ylsulfonyl)-alpha-fluoroacetates can be readily synthesized by metalation-fluorination of (1,3-benzothiazol-2-ylsulfonyl)acetates. DBU-mediated condensations of these fluorinated synthons with aldehydes proceed in a facile manner at 0 degrees C or at room temperature giving high yields of alpha-fluoro acrylates. Ketones are unreactive under these conditions. The
新的非手性和手性烷基α-(1,3-苯并噻唑-2-基磺酰基)-α-氟乙酸盐可以通过(1,3-苯并噻唑-2-基磺酰基)乙酸盐的金属氟化反应容易地合成。这些氟化合成子与醛的DBU介导的缩合反应可在0摄氏度或室温下轻松进行,从而获得高产率的α-氟代丙烯酸酯。在这些条件下,酮不起作用。与未氟化的类似物相比,氟的存在使合成子具有更大的反应性。还比较了α-(1,3-苯并噻唑-2-基磺酰基)-α-氟乙酸盐与Horner-Wadsworth-Emmons试剂(EtO)2P(O)CHFCOOEt的反应性。