Highly Regio- and Stereoselective Oxidative Hydroacetoxylation of 1,2-Allenylic Sulfoxides via a Different Mechanism
作者:Chao Zhou、Zhao Fang、Chunling Fu、Shengming Ma
DOI:10.1021/jo802755k
日期:2009.4.3
A highlyregio- and stereoselective oxidative hydroacetoxylation of 1,2-allenylicsulfoxides affording 1-sulfonyl-1-alken-3-yl acetates in moderate to good yields was developed. Through the X-ray diffraction study, it was observed that the reaction may proceed via a 5-membered cyclic intermediate and the −OAc attacks the chiral carbon atom, which is different from what was observed in our previous
Studies on the highly regio- and stereoselective selenohydroxylation of 1,2-allenylic sulfoxides with PhSeCl
作者:Guangke He、Chao Zhou、Chunling Fu、Shengming Ma
DOI:10.1016/j.tet.2007.02.049
日期:2007.4
The selenohydroxylation of 1,2-allenyl sulfoxides with PhSeCl in MeCN/H2O (10/1) afforded E-3-hydroxy-2-phenylseleno-1-alkenyl sulfoxides in good yields and high regio-/stereoselectivities.
在MeCN / H 2 O(10/1)中用PhSeCl对1,2-烯基亚砜进行硒羟基化,可得到高收率和高区域/立体选择性的E -3-羟基-2-苯基硒基-1-烯基亚砜。
Highly Regio- and Stereoselective Iodohydroxylation of 1,2-Allenylic Sulfoxides in the Presence of Benzyl Thiol
作者:Minyan Wang、Chunling Fu、Shengming Ma
DOI:10.1002/adsc.201000973
日期:2011.7
The iodohydroxylation of 1,2‐allenyl sulfoxides with iodine in the presence of benzylthiol afforded 3‐hydroxy‐2‐iodo‐2(E)‐alkenyl sulfides in good yields and high regio‐ and stereoselectivities. In this reaction it was observed that the sulfoxide functionality was reduced to sulfide and the water in the reaction mixture plays an important role for the stereoselectivity observed. A mechanism involving
It was observed that the halohydroxylation of 1,2-allenyl sulfides or selenides with Br-2 (CuBr2 or NBS) or I-2 and water demonstrated a fairly good regioselectivity (i.e., the C=C bond that is remote from the S or Se atom was halohydroxylated with the halogen atom connecting to the middle carbon atom and the hydroxyl group connecting to the non-S terminal carbon or Se-substituted terminal carbon atom of the allene moiety), leading to the synthesis of synthetically important 3-organosulfur or seleno-2-haloallylic alcohols. The stereoselectivity depends on the nature of X+ and S or Se, showing a Z-selectivity with the matched Lewis acid-base pair.
Baudin, J. B.; Julia, S. A.; Lorne, R., Bulletin de la Societe Chimique de France, 1992, # 5, p. 440 - 456