作者:Florian Kleinbeck、Gabriela J. Fettes、Lee D. Fader、Erick M. Carreira
DOI:10.1002/chem.201102797
日期:2012.3.19
A convergent synthesis of bafilomycin A1, a potent inhibitor of V‐type ATPases, is presented. The synthesis relies on the zinc triflate mediated diastereoselective addition of a complex enyne to a sensitive aldehyde as the key fragment coupling. A ruthenium‐catalyzed trans‐reduction of the resulting propargylic enyne efficiently installs the required C10–C13 trans,trans‐diene subunit, implementing
介绍了bafilomycin A 1的收敛合成,bafilomycin A 1是V型ATP酶的有效抑制剂。合成依赖于三氟甲磺酸锌介导的复杂烯炔向非对映体的非对映选择性加成,作为关键片段偶联的敏感醛。钌催化的炔丙基炔的反还原可有效地安装所需的C10–C13反式,反式二烯亚单元,从而实现了传统钯催化交叉偶联策略的替代策略。三元醇中仲羟基的高度选择性氧化为合成完成奠定了基础。
Total Syntheses of Isodomoic Acids G and H: An Exercise in Tetrasubstituted Alkene Synthesis
作者:Yike Ni、Refaie M. Kassab、Maxim V. Chevliakov、John Montgomery
DOI:10.1021/ja907931u
日期:2009.12.9
authentic material. A nickel-catalyzedcyclization constructs the pyrrolidine ring while simultaneously establishing either the E or Z stereochemistry of an exocyclic tetrasubstitutedalkene. Stereoselective assembly of both the E- and Z-alkenes of the natural products is made possible by a predictable strategy that alters the timing of substituent introduction to control alkene stereochemistry.
吡咯烷三酸天然产物异牙酸 G 和 H 的统一方法已被开发。完成了两种天然产物的全合成,并通过将 5'-(R) 和 5'-(S) 异构体与真实材料样品进行比较来确定异糖酸 G 的正确立体结构。镍催化的环化构建吡咯烷环,同时建立环外四取代烯烃的 E 或 Z 立体化学。通过改变取代基引入时间以控制烯烃立体化学的可预测策略,使天然产物的 E-和 Z-烯烃的立体选择性组装成为可能。
Stereoselective, Ag-Catalyzed Cyclizations To Access Polysubstituted Pyran Ring Systems: Synthesis of C<sub>1</sub>–C<sub>12</sub> Subunit of Madeirolide A
作者:Kazuhiro Watanabe、Jinming Li、Nagarathanam Veerasamy、Ankan Ghosh、Rich G. Carter
DOI:10.1021/acs.orglett.6b00414
日期:2016.4.15
into the scope of a silver-catalyzed cyclization (AgCC) of propargyl benzoates for accessing pyran ring systems has been reported. The impact of the degree of substitution, nature of the substitution on the carbon backbone/benzoate moiety, and stereochemistry has been evaluated. The application of this methodology to the synthesis of the C1–C12 southern fragment of madeirolide A is disclosed.
Total synthesis of ()-xyloketal D and its enantiomer Confirmation of absolute stereochemistry
作者:Jeremy D Pettigrew、Rebecca P Freeman、Peter D Wilson
DOI:10.1139/v04-138
日期:2004.11.1
The total synthesis of ()-xyloketal D and its enantiomer have been achieved by the reaction of an ortho-quinone methide with (4R)- and (4S)-4,5-dihydro-2,4-dimethylfuran via a diastereoselective inverse electron demand DielsAlderreaction. This total synthesis confirmed the absolute stereochemistry of the natural product. The ortho-quinone methide was generated by reaction of an appropriately functionalized