\documentclass{article}
\usepackage{amsmath}
\usepackage[all]{xy}

% -----------------------------------------------------------------------------
\begin{document}
   \begin{align*}
    \xymatrix{
        C \ar[r]^-{i_{k1}}  \ar[d]_-{j_2} & A_k \ar[r]^{\varphi_k^l} \ar[d]_{j_{k1}} &
        A_l \ar[r]^-{\varphi_l} \ar[d]_-{j_{l1}} & A \ar@{-->}@/^/[rdd]^{\psi} \ar[d]^-{j_1} \\
        B \ar[r]^-{j_{k2}} \ar@/_1pc/[drrrr]_-{\Psi_k \circ j_{k2}} &
        A_k \ast_C B \ar[r]^-{\Phi_k^l} \ar@/_/[drrr]^-{\Psi_k} &
        A_l \ast_C B \ar[r]^-{\Phi_l} \ar[drr]^-{\Psi_l} &
        A \ast_C B \ar@{-->}[dr]^-{\Psi} \\
        & & & & D.
    }
    \end{align*}
\end{document}
