Analogues of N-hydroxy-N′-phenylthiourea and N-hydroxy-N′-phenylurea as inhibitors of tyrosinase and melanin formation
摘要:
A series of N-hydroxy-N'-phenylthiourea and N-hydroxy-N'-phenylurea analogues were prepared and evaluated as inhibitors of tyrosinase and melanin formation. The most active analogue 1 inhibited mushroom tyrosinase with an IC(50) of around 0.29 mu M and also retained a substantial potency in cell culture by reducing pigment synthesis by 78%. Therefore, compound 1 could be considered as a promising candidate for preclinical drug development for skin hyperpigmentation application. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis of substituted N-hydroxyureas via the in situ generation of t-butoxy isocyanate
作者:Josef G. Krause、Brian D. Leskiw、Michelle L. Emery、Megan E. McGahan、Mary P. McCourt、Ronny Priefer
DOI:10.1016/j.tetlet.2010.05.002
日期:2010.7
Treatment of primary and secondary amines with tert-butylmesitylenesulfonoxycarbamate and a base afforded tert-butoxyurea, which when treated with an acid ultimately yielded substituted N-hydroxy ureas. It is proposed that this proceeded via the generation of t-butoxy isocyanate in situ. This method allows for the synthesis of both mono and disubstituted N-hydroxyureas. (C) 2010 Elsevier Ltd. All rights reserved.