“On Water” Direct Catalytic Vinylogous Aldol Reaction of Silyl Glyoxylates
作者:Hong Pan、Man-Yi Han、Pinhua Li、Lei Wang
DOI:10.1021/acs.joc.9b01945
日期:2019.11.1
The unique reactivity of water in the direct catalytic vinylogous aldolreaction of silyl glyoxylates is reported. With the hydrogen-bonding networks from water, the unfavorable homogeneous reactions in organic solvents were severely suppressed, and the "on water" relay chemistry for the vinylogous aldolreaction was realized in heterogeneous conditions (water as solvent), providing the desired α-hydroxysilanes
Organobase-catalyzed [1,2]-Brook rearrangement of silyl glyoxylates
作者:Man-Yi Han、Fei-Yan Yang、Di Zhou、Zhigang Xu
DOI:10.1039/c7ob00005g
日期:——
A highly efficient [1,2]-Brook rearrangement of silyl glyoxylates has been developed using DBU as the organobase-catalyst. This [1,2]-Brook rearrangement is applicable to a number of thiols and secondary phosphine oxides containing acidic protons. These nucleophiles afford the corresponding Brook products in high yields. Using this methodology, a formal synthesis of anti-HIV drug compound lamivudine
Synthetic Progress toward Azadirachtins. 2. Enantio- and Diastereoselective Synthesis of the Right-Wing Fragment of 11-<i>epi</i>-Azadirachtin I
作者:Ceheng Tan、Wei Chen、Xinpeng Mu、Qi Chen、Jianxian Gong、Tuoping Luo、Zhen Yang
DOI:10.1021/acs.orglett.5b00831
日期:2015.5.15
stereoselective three-component coupling reaction of allylzinc bromide, silyl glyoxylate, and a β-lactone has been developed. This has been successfully applied to the enantio- and diastereoselective synthesis of the fully functionalized furopyran moiety of azadirachtins.
Remote Stereoinduction in the Acylation of Fully Substituted Enolates: Tandem Reformatsky/Quaternary Claisen Condensations of Silyl Glyoxylates and β-Lactones
作者:Stephen N. Greszler、Justin T. Malinowski、Jeffrey S. Johnson
DOI:10.1021/ja108848d
日期:2010.12.15
glyoxylates and β-lactones to give highly functionalized Claisen condensation products. A heretofore undocumented instance of stereochemical 1,4-induction results in efficient transmission of β-lactonestereochemistry to the emerging fully substituted stereocenter. Second-stage transformations reveal that the five heteroatom-containing functionalities embedded within the products are entirely chemo-differentiated
Reformatsky 试剂依次与乙醛酸甲硅烷基酯和 β-内酯反应,得到高度官能化的克莱森缩合产物。迄今为止未记录的立体化学 1,4-诱导实例导致 β-内酯立体化学有效传输到新兴的完全取代的立体中心。第二阶段的转化表明,嵌入产品中的五个含杂原子的功能是完全化学分化的,这种情况允许快速组装 leustroducsin B 核心亚结构。
Organocatalyzed Direct Aldol Reaction of Silyl Glyoxylates for the Synthesis of α-Hydroxysilanes
作者:Man-Yi Han、Xiaoyu Xie、Di Zhou、Pinhua Li、Lei Wang
DOI:10.1021/acs.orglett.7b00811
日期:2017.5.5
A novel organocatalyzed directaldolreaction of aldehydes to silyl glyoxylates is disclosed. This method provides an efficient route to α-hydroxysilanes with excellent enantioselectivities (up to 99% ee) and high diastereoselectivities (up to >20:1 dr). In the new activation model of silyl glyoxylates, the hydrogen bond is critical to the reaction. A carbonyl group directly attached to silicon in