已经研究了苯甲酸 1-乙炔基 RC≡CO 2 CC 6 H 4 X 在 H 2 O 和 CH 3 OH 中的反应。在中性 H 2 O 中,CH 3 C≡CO 2 CC 6 H 4 X 的反应速率取决于 X 的 σ p,ρ 为 1.3。CH 3 C≡CO 2 CPh (1) 在 18 O 标记的 H 2 O 中的反应得到 CH 3 CH 2 CO 2 H 和 PhCO 2 H,相对产率为 54%,分别为 90% 和 83%,掺入单个 18酸中的 O 和 CH 3 COCH 2 O 2 CPh 的相对产率为 46%,18 O 100% 掺入两个羰基氧。这些结果可以通过以下假设来解释:至少 46% 的 1 通过环化反应生成中间体 2-羟基-1,3-二氧戊环。1 和其他炔基苯甲酸酯的甲醇分解产生 2-甲氧基-1,3-二氧戊环,证实了环化途径。以这种方式制备的 2-甲氧基-2-苯基-4-叔丁基-1,3-二氧戊环-4-烯在
An asymmetrichydrosilylation of α-oxygenated ketones was developed under the catalysis of Co(OAc)2 in combination with a chiral phosphine-amido-oxazoline (PAO) ligand, providing a mild, efficient, and enantioselective access to a variety of synthetically useful 1,2-diol derivatives. This protocol can be carried out at the gram scale with a catalyst loading of 1 mol %, and its synthetic utility was
Metal-free synthesis of α-acyloxy ketones from carboxylic acids and sulfoxonium ylides
作者:Naveen Kumar、Satyendra Kumar Pandey
DOI:10.1039/d3ob01683h
日期:——
described for synthesizing α-acyloxy ketonesfrom β-ketosulfoxonium ylides and carboxylic acids. Moderate to high yields of α-acyloxy ketones were produced using sulfoxonium ylides and carboxylic acids adorned with various functional groups. Eventually, the applicability of this approach has been shown via a large-scale reaction and transforming the synthesized α-acyloxy ketone derivatives into other valuable