Efficient and clean synthesis of N-alkyl carbamates by transcarboxylation and O-alkylation coupled reactions using a DBU-C'O IND.2' zwitterionic carbamic complex in aprotic polar media - Pérez, Eduardo R.; Silva, Michele Odnicki da; Costa, Vanessa C.; Rodrigues Filho, Ubirajara Pereira; Franco, Douglas Wagner (Tetrahedron Letters, 2002)