Reaktion #53912

Reaktionsgleichung

trans-Methanesulfonic acid 3-(4-methylamino-cyclohexyl)-prop-2-ynyl ester trifluoroacetate

4-chlorophenyl isocyanate

pyridine

→

trans-Methanesulfonic acid 3-{4-[3-(4-chloro-phenyl)-1-methyl-ureido]-cyclohexyl}-prop-2-ynyl ester

Ausbeute 101.9%

Lösungsmittel

dioxane

KHSO4 Et2O

Reaktionsbedingungen

Aufarbeitung

1. 1
   WaschenThe organic phases were washed with aqueous 10% NaCl
2. 2
   Trocknendried over Na2SO4
3. 3
   Sonstigeevaporated

Vorschrift

A solution of 1.38 g (corresponds to 3.0 mmol) of trans-Methanesulfonic acid 3-(4-methylamino-cyclohexyl)-prop-2-ynyl ester trifluoroacetate in 7 ml dioxane was first cooled to 8° C., treated with 0.69 g (4.5 mmol) 4-chlorophenyl isocyanate and then with 1.2 ml (15 mmol; 5 equivalents) of pyridine (during 3 min). After 45 min at RT, the mixture was dissolved in aqueous 10% KHSO4/Et2O (3×). The organic phases were washed with aqueous 10% NaCl, dried over Na2SO4 and evaporated to give 1.22 g (quantitative) of crude trans-Methanesulfonic acid 3-{4-[3-(4-chloro-phenyl)-1-methyl-ureido]-cyclohexyl}-prop-2-ynyl ester, MS: 398 (MH+, 1Cl). The crude product was directly used in the next step.

Quelle