Pd(II)-catalyzed oxidative double cyclization of the 1,2-diarylethynes bearing an N-methyl-N-(2-methoxycarbonyl)ethylamino and an aminosulfonyl group afforded indolobenzothiazine S,S-dioxides in good to excellent yields. The 2-(methoxycarbonyl)ethyl group attached to the indolyl nitrogen is readily removed under basic conditions (DBU, DMF, 120 °C) to provide the corresponding tetracycles with a free
                                    Pd(II)催化的带有N-甲基-N-(2-甲氧基羰基)乙基
氨基和
氨基磺酰基的1,2-二芳基
乙炔的氧化双环化反应以良好或优异的收率得到了
吲哚苯并
噻嗪S,S-二氧化物。在碱性条件下(
DBU,
DMF,120°C),很容易除去与
吲哚基氮原子相连的2-(甲氧基羰基)乙基,从而以优异的产率为相应的四环提供了游离的
吲哚基氮原子。