De Paolis Michaël, Chiaroni Angèle, Zhu Jieping
Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette, France.
Chem Commun (Camb). 2003 Dec 7(23):2896-7. doi: 10.1039/b309824a.
Synthesis of tetrahydroisoquinoline with a 1,4-bridged 10-membered sulfur containing macrolactone (5) is described. Phenolic aldolisation, Pictet-Spengler cyclisation of an acid sensitive amino diol under newly developed conditions (LiBr, toluene-TFE, 80 degrees C) and acid promoted intramolecular C-S bond formation leading to a 10-membered cycle are key steps of our synthesis.