Volume 2020, Issue 7 p. 784-795
Full Paper

Selenocystine Peptides Performance in 5-endo-dig Reactions

Sindija Lapcinska

Sindija Lapcinska

Latvian Institute of Organic Synthesis, 21 Aizkraukles Str., 1006 Riga, Latvia

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Pavel Arsenyan

Corresponding Author

Pavel Arsenyan

Latvian Institute of Organic Synthesis, 21 Aizkraukles Str., 1006 Riga, Latvia

Latvian Institute of Organic Synthesis, 21 Aizkraukles Str., Riga, 1006, Latvia

E-mail: [email protected]

http://osi.lv/en/laboratories/pharmacomodulators-synthesis-group/

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First published: 07 January 2020
Citations: 17

Graphical Abstract

Copper(II) bromide and oxidant promoted 5-endo-dig and 5-endo-dig/6-endo-dig cascade reactions are presented. Substituted benzo[b]furans, indoles, and indeno[1,2-c]chromenes bearing Sec-peptides in position 3 were prepared. This procedure can be successfully applied for protected and unprotected peptides obtained in up to quantitative yields.

Abstract

Herein, we present methods for the generation of selenocysteinyl electrophile by weak Lewis acids or oxidants. The electrophilic selenium species were further utilized in 5-endo-dig cyclization reactions with 2-ethynyl phenols, anisoles, and anilines, yielding substituted benzo[b]furans and indoles bearing short selenocysteine-containing peptides. Copper(II) bromide promoted 5-endo-dig cyclization can be successfully applied for protected and unprotected peptides in high yields. Elaborated protocol allows the construction of phenylindeno[1,2-c]chromene moiety in 5-endo-dig/6-endo-dig cascade reactions.