Synthesis of New Benzocyclotrimer Analogues: New Receptors for Tetramethylammonium Ion Recognition
摘要:
Using a [2 + 2 + 2] cycloaddition/Mitsunobu reaction sequence, a convenient synthesis to access new benzocyclotrimer analogues has been developed. The new receptors have the geometry and functionality capable of recognizing the tetramethylammonium ion in the gas phase and in solution.
Enantioselective Copper-Catalyzed Intramolecular Phenolic OH Bond Insertion: Synthesis of Chiral 2-Carboxy Dihydrobenzofurans, Dihydrobenzopyrans, and Tetrahydrobenzooxepines
Efficient: A copper‐catalyzed enantioselective intramolecular insertion of carbenoids into phenolic OHbonds has been developed. This method can be used for the synthesis of the title compounds in high yields and excellent enantioselectivities under mild and neutral conditions (see scheme). NaBArF=sodium tetrakis[3,5‐bis(trifluoromethyl)phenyl]borate.
有效:一个铜催化卡宾成酚类的O对映选择性分子内插入 H键已经研制成功。该方法可用于在温和和中性条件下以高收率和出色的对映选择性合成标题化合物(参见方案)。NaBAr F =四[3,5-双(三氟甲基)苯基]硼酸钠。