New stereospecific synthesis of Tesaglitazar and Navaglitazar precursors
作者:Elisabetta Brenna、Claudio Fuganti、Francesco G. Gatti、Fabio Parmeggiani
DOI:10.1016/j.tetasy.2009.10.027
日期:2009.12
A new synthetic route of to pharmaceutical intermediates (S)-1a-b and (S)-14 is reported. The reaction pathway is based on the baker's yeast-mediated reduction of the alpha-alkoxy cinnamaldehydes 9a-c to give the corresponding (S)-alcohols in good yields and excellent ee. (C) 2009 Elsevier Ltd. All rights reserved.
Gold(I)-catalysed [3+3] cycloaddition of propargyl acetals and nitrones
作者:Sigvart Evjen、Anne Fiksdahl
DOI:10.1016/j.tet.2016.04.058
日期:2016.6
the understanding of the gold(I) catalysis chemistry of propargyl acetals, a gold(I) catalysed [3+3] cycloaddition reaction of propargyl acetals with nitrones has been studied. A series of 5-methoxy-3,6-dihydro-2H-1,2-oxazine products with two stereogenic centres were obtained in a cis-stereoselective manner. The formal [3+3] cycloaddition reaction is supposed to go through O-nucleophilic attack of
在我们的一系列研究中,为加深对炔丙基缩醛的金(I)催化化学的理解,研究了金(I)催化的炔丙基缩醛与硝酮的[3 + 3]环加成反应。以顺式-立体选择性的方式获得了具有两个立体生成中心的一系列5-甲氧基-3,6-二氢-2 H -1,2-恶嗪产物。正式的[3 + 3]环加成反应应该经过硝酮对C的O-亲核攻击由炔丙基缩醛产生的金络合物的1位,随后进行最终的闭环。硝酮的另一种C3氧化作用可提供醛产物,并且代表了竞争途径。为了证明反应的潜力和局限性,讨论了环加成反应的化学选择性。
Productivity enhancement of CC bioreductions by coupling the in situ substrate feeding product removal technology with isolated enzymes
作者:Elisabetta Brenna、Francesco G. Gatti、Daniela Monti、Fabio Parmeggiani、Alessandro Sacchetti
DOI:10.1039/c1cc16014a
日期:——
To overcome the usually low productivities of the CC bond bioreduction of α,β-unsaturated aldehydes we combined the in situ substrate feeding product removal (SFPR) technology with a cascade system comprising an isolated ene-reductase and a chemoselective alcohol dehydrogenase.
为了克服α、β-不饱和醛的 CC 键生物还原中通常存在的低生产率问题,我们将原位底物进料产物去除(SFPR)技术与由分离的烯还原酶和化学选择性醇脱氢酶组成的级联系统相结合。