Mercury(II) Chloride-Mediated Cyclization−Rearrangement of O-Propargylglycolaldehyde Dithioacetals to 3-Pyranone Dithioketals: An Expeditious Access to 3-Pyranones
摘要:
O-Propargyl glycolaldehyde dithioacetals undergo a unique cyclization-rearrangement in the presence of mercuric chloride and calcium carbonate to afford 3-pyranones exclusively or along with 2,5-dihydrofuran-3-carboxaldehydes via their dithioketals and dithioacetals.
Mercury(II) Chloride-Mediated Cyclization−Rearrangement of O-Propargylglycolaldehyde Dithioacetals to 3-Pyranone Dithioketals: An Expeditious Access to 3-Pyranones
摘要:
O-Propargyl glycolaldehyde dithioacetals undergo a unique cyclization-rearrangement in the presence of mercuric chloride and calcium carbonate to afford 3-pyranones exclusively or along with 2,5-dihydrofuran-3-carboxaldehydes via their dithioketals and dithioacetals.
Aniline mediated oxidative C–C bond cleavage of α-alkoxy aldehydes in air and a model reaction for the synthesis of α-(d)-amino acid derivatives
作者:Bin Hu、Yunfeng Li、Zhongjun Li、Xiangbao Meng
DOI:10.1039/c3ob40685g
日期:——
4-methyl aniline mediated method for the oxidativeC–C bond cleavage has been developed. The reaction proceeds in airusing molecular oxygen as the oxidant, affording one-carbon shortened esters in moderate to good yields within a short time. Moreover, it provides a model reaction for the highly enantioselective synthesis of (D)-serine esters by combining with a L-proline catalyzed Mannich reaction.
Lewis Base Catalyzed 1,3-Dithiane Addition to Carbonyl Compounds Using 2-Trimethylsilyl-1,3-dithiane
作者:Makoto Michida、Teruaki Mukaiyama
DOI:10.1246/cl.2008.26
日期:2008.1.5
1,3-Dithiane addition to various aldehydes and ketones using 2-trimethylsilyl-1,3-dithiane in the presence of a catalytic amount of a Lewis base such as tetrabutylammonium phenoxide (PhONn-Bu4) proceeds smoothly to afford the corresponding α-hydroxy dithiane compounds in good to high yields under mild conditions.
Mercury(II) Chloride-Mediated Cyclization−Rearrangement of <i>O</i>-Propargylglycolaldehyde Dithioacetals to 3-Pyranone Dithioketals: An Expeditious Access to 3-Pyranones
作者:Subir Ghorai、Anup Bhattacharjya
DOI:10.1021/ol047893a
日期:2005.1.1
O-Propargyl glycolaldehyde dithioacetals undergo a unique cyclization-rearrangement in the presence of mercuric chloride and calcium carbonate to afford 3-pyranones exclusively or along with 2,5-dihydrofuran-3-carboxaldehydes via their dithioketals and dithioacetals.