作者:Isuru Dissanayake、Jacob D. Hart、Emma C. Becroft、Christopher J. Sumby、Christopher G. Newton
DOI:10.1021/jacs.0c06306
日期:2020.8.5
5-Bis(tert-butyldimethylsilyloxy)furans are established as vicinal bisketene equivalents for application as dienes in the Diels-Alderreaction. Cycloaddition with olefinic dienophiles, under exceptionally mild conditions, enables convergent access to highly substituted para-hydroquinones in unprotected form via a one-pot Diels-Alder/ring-opening/tautomerization sequence. The synthesis of para-benzoquinones from
Diverse diaryl sulfide synthesis through consecutive aryne reactions
作者:Hana Nakajima、Yuki Hazama、Yuki Sakata、Keisuke Uchida、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1039/d0cc08373a
日期:——
An efficient method to synthesize diaryl sulfides with structural diversity is disclosed. Demethylative hydrothiolation of aryne intermediates generated from o-iodoaryl triflates with methylthio-substituted o-silylaryl triflates and further aryne reactions afford diverse diaryl sulfides.
Enantioselective Transfer Hydrogenative Cycloaddition Unlocks the Total Synthesis of SF2446 B3: An Aglycone of Arenimycin and SF2446 Type II Polyketide Antibiotics
作者:Nancy O. Huynh、Tomáš Hodík、Michael J. Krische
DOI:10.1021/jacs.3c06225
日期:2023.8.9
The first total synthesis and structure validation of an arenimycin/SF2446 type II polyketide is described, as represented by de novo construction of SF2446 B3, the aglycone shared by this family of type II polyketides. Ruthenium-catalyzed α-ketol-benzocyclobutenone [4 + 2] cycloaddition, which occurs via successive stereoablation-stereoregeneration, affects a double dynamic kinetic asymmetric transformation
描述了芳霉素/SF2446 II 型聚酮化合物的首次全合成和结构验证,以 SF2446 B3 的从头构建为代表,SF2446 B3 是该 II 型聚酮化合物家族共有的糖苷配基。钌催化的α-酮醇-苯并环丁烯酮[4 + 2]环加成通过连续的立体消融-立体再生发生,影响双动态动力学不对称转变,其中两种外消旋起始材料结合形成拥挤的安古环素海湾区域,并控制区域、非对映体- 和对映选择性。这项工作代表了转移氢化环加成和对映选择性分子间金属催化 C-C 键活化在靶向合成中的首次应用。
New efficient protocol for aryne generation. Selective synthesis of differentially protected 1,4,5-naphthalenetriols
Arynes are generated cleanly and rapidly by halogen-lithium exchange of ortho-haloaryl triflates with n-BuLi at -78-degrees-C. [2+4]-Cycloaddition of alpha-alkoxyaryne with 2-methoxyfuran proceeded regioselectively (head-to-head) to afford 1,4,5-naphthalenetriols.